Skip to main content

Flutelike Porous Hematite Nanorods and Branched Nanostructures: Synthesis, Characterisation and Application for Gas-Sensing

Journal Article


Abstract


  • Flute-like porous a-Fe2O3

    nanorods and branched nanostructures

    such as pentapods and hexapods were

    prepared through dehydration and recrystallisation

    ofhydrot hermally synthesised

    b-FeOOH precursor. Transmission

    electron microscopy (TEM),

    high-resolution TEM and selected area

    electron diffraction analyses reveal that

    the nanorods, which grow along the

    [110] direction, have nearly hollow cavities

    and porous walls with a pore size

    of20ÃÂÿ50 nm. The hexapods have six

    symmetric arms with a diameter of60ÃÂÿ

    80 nm and length of400ÃÂÿ90 0 nm. The

    growth direction ofthe arms in the

    hexapod-like nanostructure is also

    along the [110] direction, and there is a

    dihedral angle of69.5 o between adjacent

    arms. These unique iron oxide

    nanostructures offer the first opportunity

    to investigate their magnetic and

    gas sensing properties. The nanostructures

    exhibited unusual magnetic behaviour,

    with two different Morin temperatures

    under field-cooled and zerofield-

    cooled conditions, owing to their

    shape anisotropy and magnetocrystalline

    anisotropy. Furthermore, the a-

    Fe2O3 nanostructures show much

    better sensing performance towards

    ethanol than that ofthe previously reported

    polycrystalline nanotubes. In

    addition, the a-Fe2O3 nanostructure

    based sensor can selectively detect

    formaldehyde and acetic acid among

    other toxic, corrosive and irritant vapours

    at a low working temperature

    with rapid response, high sensitivity

    and good stability.

Authors


  •   Gou, Xing L. (external author)
  •   Wang, Guoxiu
  •   Kong, Xiang y. (external author)
  •   Wexler, David
  •   Horvat, Josip
  •   Yang, Juan (external author)
  •   Park, Jinsoo (external author)

Publication Date


  • 2008

Citation


  • Gou, X. L., Wang, G., Kong, X. y., Wexler, D., Horvat, J., Yang, J. & Park, J. (2008). Flutelike Porous Hematite Nanorods and Branched Nanostructures: Synthesis, Characterisation and Application for Gas-Sensing. Chemistry: A European Journal, 14 (19), 5996-6002.

Scopus Eid


  • 2-s2.0-53849122948

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/3061

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 5996

End Page


  • 6002

Volume


  • 14

Issue


  • 19

Abstract


  • Flute-like porous a-Fe2O3

    nanorods and branched nanostructures

    such as pentapods and hexapods were

    prepared through dehydration and recrystallisation

    ofhydrot hermally synthesised

    b-FeOOH precursor. Transmission

    electron microscopy (TEM),

    high-resolution TEM and selected area

    electron diffraction analyses reveal that

    the nanorods, which grow along the

    [110] direction, have nearly hollow cavities

    and porous walls with a pore size

    of20ÃÂÿ50 nm. The hexapods have six

    symmetric arms with a diameter of60ÃÂÿ

    80 nm and length of400ÃÂÿ90 0 nm. The

    growth direction ofthe arms in the

    hexapod-like nanostructure is also

    along the [110] direction, and there is a

    dihedral angle of69.5 o between adjacent

    arms. These unique iron oxide

    nanostructures offer the first opportunity

    to investigate their magnetic and

    gas sensing properties. The nanostructures

    exhibited unusual magnetic behaviour,

    with two different Morin temperatures

    under field-cooled and zerofield-

    cooled conditions, owing to their

    shape anisotropy and magnetocrystalline

    anisotropy. Furthermore, the a-

    Fe2O3 nanostructures show much

    better sensing performance towards

    ethanol than that ofthe previously reported

    polycrystalline nanotubes. In

    addition, the a-Fe2O3 nanostructure

    based sensor can selectively detect

    formaldehyde and acetic acid among

    other toxic, corrosive and irritant vapours

    at a low working temperature

    with rapid response, high sensitivity

    and good stability.

Authors


  •   Gou, Xing L. (external author)
  •   Wang, Guoxiu
  •   Kong, Xiang y. (external author)
  •   Wexler, David
  •   Horvat, Josip
  •   Yang, Juan (external author)
  •   Park, Jinsoo (external author)

Publication Date


  • 2008

Citation


  • Gou, X. L., Wang, G., Kong, X. y., Wexler, D., Horvat, J., Yang, J. & Park, J. (2008). Flutelike Porous Hematite Nanorods and Branched Nanostructures: Synthesis, Characterisation and Application for Gas-Sensing. Chemistry: A European Journal, 14 (19), 5996-6002.

Scopus Eid


  • 2-s2.0-53849122948

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/3061

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 5996

End Page


  • 6002

Volume


  • 14

Issue


  • 19